Incandescent electric lamp



(No Model.)

W. B. NICKERSON.

INGANDESGENT ELECTRIC LAMP.

No. 500,078. Patented June 20, 1893.

UNITED STATES PATENT OFFICE.

IVILLIAM EMERY NICKERSON, OF CAMBRIDGE, MASSACHUSETTS.

INCANDESCENT ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 500,078, dated June 20,1893. Application filed April 5, 1893. Serial No. 469,188- (No model.)

To all whom it may concern.-

' Be it known that I, WILLIAM EMEEY NICK- ERsoN, of Cambridge, in thecounty of Middlesexand State of Massachusetts, have invented a new anduseful Improvement in In candescent Electric Lamps, of which thefollowing, taken in connection with the accom panying drawing, is aspecification.

My invention relates to incandescent electric lamps of that class inwhich the neck of the lamp globe is closed and the leading-in wiressupported by a cement plug.

It consists of a device by which the heat from the incandescent filamentis prevented from aifecting the cement plug by which the lamp globe ismade air tight.

In the accompanying drawing I represents the glass globe of anincandescent electric lamp, J the filament attached atjjtotheleadi'ng-in wires K K. g

L is a disk of mica or other suitable substance resting upon a shoulderZformed in the neck of the lamp globe, and serving to support thefusible cement plug M, and the leading-in wires K K.

N is a disk smaller but similar to L and rests upon the shoulder It alsoformed in the neck of the lamp globe. The space between the disk II andthe disk N is occupied by the ing-in wires K K, disk II, cement plug M,the

disk N, and the filling of sand 0, substantially as and for the purposeset forth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, on this 3d day of April, A. D.1893.

WVILLIAM EMERY NICKERSON.

lVitnesses:

FRANK G. PARKER, FRANK G. HATTIE.

